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docs: Move 'Events' to design docs

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Signed-off-by: David Mehren <git@herrmehren.de>
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David Mehren 2023-03-12 21:31:29 +01:00
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docs/content/dev/events.md → docs/content/dev/design_docs/events.md
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In HedgeDoc we use an event system based on [EventEmitter2][eventemitter2]. It's used to reduce circular dependencies between different services and inform these services about changes.
# Events
In HedgeDoc 2, we use an event system based on [EventEmitter2][eventemitter2].
It's used to reduce circular dependencies between different services and inform these services about changes.
HedgeDoc's system is basically [the system NestJS offers][nestjs/eventemitter].
The config for the `EventEmitterModule` is stored in `events.ts` and exported as `eventModuleConfig`.
In the same file enums for the event keys are defined. Each of these events is expected to be sent with an additional value. In the enum defintion a comment should tell you what exactly this value should be.
In the same file enums for the event keys are defined. Each of these events is expected to be sent with an additional value.
In the enum definition a comment should tell you what exactly this value should be.
[eventemitter2]: https://github.com/EventEmitter2/EventEmitter2
[nestjs/eventemitter]: https://docs.nestjs.com/techniques/events